Question

The angle between pass axis of polarizer and analyser is $45^{\circ }$. The percentage of polarized light passing through analyser is

• A. $75\%$
• B. $25\%$
• C. $50\%$
• D. $100\%$

Answer 1

Answer: (C)

Given,
$\theta =45^0$
By malus law,
$I\propto {\cos }^2\theta$
$I\propto {\left(\cos 45^0\right)}^2$
$I\propto {\left(\frac{1}{\sqrt{2}}\right)}^2$
$I\propto (0.5)$
The percentage of polarized light passing through analyzer is $50\%$.